Thomson principle
= Thomson principle
{c}
{wiki}
<Thomson principle> says that effective resistance is the minimum energy among unit flows from $a$ to $z$:
$$
R_{\mathrm{eff}}(a,z)=\inf_\theta\sum_e\frac{\theta(e)^2}{c(e)}.
$$
= Thomson principle
{c}
{wiki}
<Thomson principle> says that effective resistance is the minimum energy among unit flows from $a$ to $z$:
$$
R_{\mathrm{eff}}(a,z)=\inf_\theta\sum_e\frac{\theta(e)^2}{c(e)}.
$$